The three codons in the genetic code that do not specify amino acids are called

Special-sense codons

Explanation:

The 3 triplets UAA, UAG, UGA do not code for any amino acid. They were originally described as non-sense codons, as against the 61 codons, which are termed as sense codons.

However, since the 3 triplets UAA, UAG, UGA help to signal the natural end of translation of a peptidyl chain, they are more appropriately called Special-sense codons

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.